<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>获取两个 set 的并集</title>
</head>
<body>
    
</body>
</html>
<script>
    var obj = new Set([1,2,3]);
    var obj2 = new Set([2,3,4,5]);
    var arr = new Set([...obj,...obj2]);
    console.log(arr);
</script>